Question

please help this is very important:)
Solve the following system of equations using matrices.
x + 3y = 13
2x - y = -9

Answer 1

Matrices? Not familiar with the concept although I can tell you the solution.

Answer 2

what is it?

Answer 3

Using matrices, just make a grid of numbers and work on that grid instead.

Answer 4

To set up your problem just get rid of all the variables and operator signs, keeping the coefficients.

Answer 5

well thank you both:)

Answer 6

\(\begin{pmatrix}
1 & 3 & 13\\
2 & -1 & -9
\end{pmatrix}\)
then you will want to put it in what is called row-reduced echelon form, to which this site might help: http://www.math.odu.edu/~bogacki/cgi-bin/lat.cgi?c=rref
You'll want to enter your matrix in there - it's 2 rows by 3 columns.

Let us know what you get. You should get
\(\begin{pmatrix}
1 & 0 & a\\
0 & 1 & b
\end{pmatrix}\)
where x=a is the answer to x, and y=b is the answer to y.

Answer 7

the website will automatically generate a solution for the actual matrix "solving"